S1.4 Counting particles by mass: The mole Quiz
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5 questions, one answer each
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1. What amount of NaOH is in 25.0 cm³ of 0.400 mol dm⁻³ solution?
- A. 1.00 × 10⁻² mol
- B. 10.0 mol
- C. 1.60 × 10⁻² mol
- D. 6.25 × 10⁻² mol
2. Which sample contains the greatest number of atoms?
- A. 1.0 mol of He
- B. 1.0 mol of O₂
- C. 1.0 mol of H₂O
- D. 1.0 mol of NH₃
3. A compound contains 40.0% C, 6.7% H and 53.3% O by mass. What is its empirical formula?
- A. CHO
- B. CH₂O
- C. C₂H₄O
- D. CH₄O
4. What is the molar mass of Mg(NO₃)₂?
- A. 86.32 g mol⁻¹
- B. 148.33 g mol⁻¹
- C. 134.32 g mol⁻¹
- D. 148.33 (no units)
5. At the same temperature and pressure, 10 cm³ of N₂ reacts with H₂: N₂ + 3H₂ → 2NH₃. What volume of NH₃ forms?
- A. 10 cm³
- B. 20 cm³
- C. 30 cm³
- D. 40 cm³